Update Chromoting to use /third_party/closure_compiler.

remoting/webapp/crd/js/hangout_session.js

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @fileoverview
  * Class to communicate with the background scripts via chrome runtime
  * messages to
  * 1. Forward session state notifications
  * 2. Closes the window when the session terminates
@@ skipping 25 matching lines @@
 remoting.HangoutSession.prototype.init = function() {
   var portName = 'it2me.helper.webapp@' + this.senderId_;
   this.port_ = chrome.runtime.connect({name: portName});
 
   remoting.hangoutSessionEvents.addEventListener(
       remoting.hangoutSessionEvents.sessionStateChanged,
       this.onSessionStateChanged_.bind(this));
 };
 
 /**
- * @param {remoting.ClientSession.State} state
+ * @param {remoting.ClientSession.State=} state
  */
 remoting.HangoutSession.prototype.onSessionStateChanged_ = function(state) {
   var State = remoting.ClientSession.State;
   try {
     this.port_.postMessage({method: 'sessionStateChanged', state: state});
-  } catch (e) {
+  } catch (/** @type {*} */ e) {
     // postMessage will throw an exception if the port is disconnected.
     // We can safely ignore this exception.
-    var error = /** @type {Error} */ e;
+    var error = /** @type {Error} */ (e);
     console.error(error);
   } finally {
     if (state === State.FAILED || state === State.CLOSED) {
       // close the current window
       if (base.isAppsV2()) {
         chrome.app.window.current().close();
       } else {
         window.close();
       }
     }
   }
 };
 
 
 /**
  * remoting.clientSession does not exist until the session is connected.
  * hangoutSessionEvents serves as a global event source to plumb session
  * state changes until we cleanup clientSession and sessionConnector.
  * @type {base.EventSource}
  */
 remoting.hangoutSessionEvents = new base.EventSource();
 
 /** @type {string} */
 remoting.hangoutSessionEvents.sessionStateChanged = "sessionStateChanged";
 
 remoting.hangoutSessionEvents.defineEvents(
-    [remoting.hangoutSessionEvents.sessionStateChanged]);
+    [remoting.hangoutSessionEvents.sessionStateChanged]);